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d-compiler.s
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d-compiler.s
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;D-Compiler - decompiles E-Tracker tunes
;(C) 1994 Stefan Drissen
;last update: 1 November, 09:53
ORG 0
DUMP 1,0
JP start+32768
DEFM " D-Compiler version 1.00"
DEFM "(C) 1994 Stefan Drissen 31.10.94"
DEFM "--------------------------------"
DEFM " "
module: DEFW 2048
ORG 102
DUMP 1,$
exit:
LD SP,32768
LD HL,0
exit.count:
DEC HL
LD A,H
OR L
JR NZ,exit.count
sthmpr: LD A,0
OUT (251),A
stsptr: LD SP,0
JP high+32768
high:
stlmpr: LD A,0
OUT (250),A
EI
RET
start:
DI
IN A,(250)
LD (stlmpr+32769),A
IN A,(251)
LD (sthmpr+32769),A
LD (stsptr+32769),SP
LD A,33
OUT (250),A
LD SP,32768
JP low
low:
LD HL,(module)
LD (mod.start+1),HL
CALL calc.addr
LD (song.pointer+1),BC
CALL calc.addr
LD (pat.pointer+2),BC
CALL calc.addr
LD (ins.pointer+1),BC
CALL calc.addr
LD (orn.pointer+1),BC
CALL calc.addr
LD A,(BC)
INC BC
LD (voldatabyte+1),A
LD (cmpvollist+1),BC
;============
; song table
;============
LD A,emod.page
OUT (251),A
XOR A
LD (esong.lngth),A
LD (esong.loop2),A
LD HL,esong.table
LD DE,esong.table+1
LD BC,512-1
LD (HL),A
LDIR
LD DE,esong.table
song.pointer: LD HL,0
LD B,0
nxtpat: LD C,(HL)
INC HL
LD A,C
INC A
JR Z,song.loop ;A=255
INC A
JR Z,set.loop ;A=254
SUB 98
JR NC,set.height ;A>=96
LD A,C
LD C,-1
div3: INC C
SUB 3
JR NC,div3
LD A,C
LD (DE),A
INC DE
LD A,B
LD (DE),A
INC DE
JR nxtpat
set.height:
CP 48
JR C,nonegpat
SUB 96
nonegpat:
DEC A
LD B,A
JR nxtpat
set.loop:
PUSH HL
PUSH DE
EX DE,HL
LD DE,esong.table
OR A
SBC HL,DE
RR H
SRL L
LD A,L
LD (esong.loop2),A
POP DE
POP HL
JR nxtpat
song.loop:
EX DE,HL
LD DE,esong.table
OR A
SBC HL,DE
RR H
SRL L
LD A,L
LD (esong.lngth),A
LD HL,esong.table
LD BC,0
count.pat:
LD A,(HL)
INC HL
INC HL
CP C
JR C,$+3
LD C,A
DJNZ count.pat
INC C
LD A,C
LD (num.pats+1),A
;==========
; patterns
;==========
LD A,emod.page
OUT (251),A
LD HL,t.patlen
LD DE,t.patlen+1
LD BC,31
LD (HL),64
LDIR
LD HL,epatterns
LD E,32
patalp:
LD C,64
patclp:
LD B,6
patblp:
LD (HL),%10001111
INC HL
LD (HL),%11111111
INC HL
LD (HL),%10000000
INC HL
DJNZ patblp
DEC C
JR NZ,patclp
BIT 6,H
RES 6,H
JR Z,$+3
INC A
OUT (251),A
DEC E
JR NZ,patalp
LD A,emod.page
OUT (251),A
pat.pointer: LD IX,0
LD IY,t.patlen
LD DE,epatterns
num.pats: LD C,0
conv.all:
LD B,6
conv.six:
PUSH BC
LD L,(IX+0)
LD H,(IX+1)
INC IX
INC IX
LD BC,(mod.start+1)
ADD HL,BC
PUSH DE
LD A,31
LD (ins),A
LD (orn),A
LD A,15
LD (note),A
XOR A
EX AF,AF'
CALL convert
POP DE
INC DE
INC DE
INC DE
POP BC
DJNZ conv.six
EX AF,AF'
LD (IY),A
INC IY
LD HL,63*6*3
ADD HL,DE
EX DE,HL
IN A,(251)
BIT 6,D
RES 6,D
JR Z,$+3
INC A
OUT (251),A
DEC C
JR NZ,conv.all
LD A,emod.page
OUT (251),A
LD HL,t.patlen
LD DE,epatt.lngth
LD BC,32
LDIR
;===========
; ornaments
;===========
LD A,emod.page+2
OUT (251),A
LD HL,eornam.data
LD DE,eornam.data+1
LD BC,32*256-1
LD (HL),0
LDIR
LD HL,t.ornhead
LD DE,t.ornhead+1
LD BC,32*4-1
LD (HL),0
LDIR
LD HL,(cmpvollist+1)
DEC HL
orn.pointer:
LD DE,0
OR A
SBC HL,DE
LD A,L
RRCA
OR A
JP Z,skip.ornament
LD IX,(orn.pointer+1)
LD IY,t.ornhead
LD DE,eornam.data
LD B,A
orn.blp:
PUSH BC
PUSH DE
XOR A
LD (orn.loop+1),A
LD (orn.count+1),A
INC A
LD (orn.reg+1),A
LD L,(IX+0)
LD H,(IX+1)
INC IX
INC IX
LD BC,(mod.start+1)
ADD HL,BC
cont.orn:
LD A,(HL)
INC HL
CP 96
JR C,orn.reg
INC A
JR Z,orn.loop
INC A
JR Z,set.ornloop
SUB 96
LD (orn.reg+1),A
JR cont.orn
orn.loop:
LD A,0
orn.count: LD C,0
DEC C
OR A
JR Z,not.looped
LD (IY+0),C
JR orn.done
not.looped:
LD (IY+2),C
JR orn.done
set.ornloop:
LD A,(orn.count+1)
LD (IY+1),A
LD A,1
LD (orn.loop+1),A
JR cont.orn
orn.reg:
LD B,0
LD C,B
CP 48
JR C,ornlen.blp
SUB 96
ornlen.blp:
LD (DE),A
INC DE
DJNZ ornlen.blp
LD A,(orn.count+1)
ADD C
LD (orn.count+1),A
LD A,1
LD (orn.reg+1),A
JR cont.orn
orn.done:
LD DE,4
ADD IY,DE
POP DE
INC D
POP BC
DJNZ orn.blp
skip.ornament:
LD A,emod.page
OUT (251),A
LD HL,t.ornhead
LD DE,eorn.header
LD BC,32*4
LDIR
;=============
; instruments
;=============
LD A,emod.page+2
OUT (251),A
LD HL,einstr.data
LD DE,einstr.data+4
LD BC,16*1024
LD (HL),0
INC HL
LD (HL),%00000100
INC HL
LD (HL),0
INC HL
LD (HL),0
LD HL,einstr.data
LDIR
INC A
OUT (251),A
RES 6,H
RES 6,D
LD BC,16*1024-4
LDIR
DEC A
OUT (251),A
LD HL,t.inshead
LD DE,t.inshead+1
LD BC,32*4-1
LD (HL),0
LDIR
LD HL,(orn.pointer+1)
ins.pointer:
LD DE,0
OR A
SBC HL,DE
LD A,L
RRCA
LD IX,(ins.pointer+1)
LD IY,t.inshead
LD DE,einstr.data
LD B,A
ins.blp:
PUSH BC
PUSH DE
XOR A
LD (ins.loop+1),A
LD (ins.count+1),A
INC A
LD (dev.count+1),A
LD (vol.count+1),A
LD L,(IX+0)
LD H,(IX+1)
INC IX
INC IX
LD BC,(mod.start+1)
ADD HL,BC
cont.ins:
dev.count: LD A,0
DEC A
JR NZ,nodevchange
LD A,1
LD (dev.count+1),A
retdev: LD A,(HL)
INC HL
RRCA
JR NC,deviation
INC DE
INC DE
INC DE
PUSH AF
AND %00000111
LD B,A
LD C,(HL)
INC HL
BIT 2,B
JR Z,notnegdev
PUSH HL
LD HL,2048
OR A
SBC HL,BC
SET 7,H
LD C,L
LD B,H
POP HL
notnegdev:
LD A,B
LD (devhi+1),A
LD (DE),A
DEC DE
LD A,C
LD (devlo+1),A
LD (DE),A
DEC DE
POP AF
RRCA
RRCA
RRCA
LD C,A
RRCA
RRCA
AND %00000011
BIT 0,C
JR Z,$+4
SET 2,A
BIT 1,C
JR Z,$+4
SET 3,A
LD (freqnoise+1),A
LD (DE),A
DEC DE
JR dev.reg
deviation:
CP 127
JR Z,set.insloop
CP 126
JR Z,ins.loop
ADD A,2
LD (dev.count+1),A
JR retdev
ins.loop:
LD A,0
ins.count: LD C,0
DEC C
OR A
JR Z,inot.looped
LD (IY+0),C
JR ins.done
inot.looped:
LD (IY+2),C
JR ins.done
set.insloop:
LD A,(ins.count+1)
LD (IY+1),A
LD A,1
LD (ins.loop+1),A
JR cont.ins
nodevchange:
LD (dev.count+1),A
INC DE
freqnoise: LD A,0
LD (DE),A
INC DE
devlo: LD A,0
LD (DE),A
INC DE
devhi: LD A,0
LD (DE),A
DEC DE
DEC DE
DEC DE
dev.reg:
LD A,(ins.count+1)
INC A
LD (ins.count+1),A
vol.count: LD A,0
DEC A
JR NZ,novolchange
LD A,(HL)
INC HL
voldatabyte: CP 0
JR NZ,newvol
LD C,(HL)
INC HL
foundvol: LD A,(HL)
INC HL
retvol: LD (volume+1),A
LD A,C
JR novolchange
newvol: PUSH HL
LD B,A
cmpvollist: LD HL,0
nxtinvolst: LD A,(HL)
OR A
JR Z,volnotfound
INC HL
LD C,(HL)
INC HL
CP B
JR NZ,nxtinvolst
POP HL
JR foundvol
volnotfound:
POP HL
LD C,1
LD A,B
JR retvol
novolchange:
LD (vol.count+1),A
volume: LD A,0
LD (DE),A
INC DE
INC DE
INC DE
INC DE
JP cont.ins
ins.done:
LD DE,4
ADD IY,DE
POP DE
INC D
INC D
INC D
INC D
IN A,(251)
BIT 6,D
RES 6,D
JR Z,$+3
INC A
OUT (251),A
POP BC
DEC B
JP NZ,ins.blp
LD A,emod.page
OUT (251),A
LD HL,t.inshead
LD DE,eins.header
LD BC,32*4
LDIR
JP exit
comlist:
DEFB 210
DEFW waitnx
DEFB 114
DEFW nwnote
DEFB 082
DEFW instrm
DEFB 081
DEFW patbrk
DEFB 080
DEFW cncins
DEFB 048
DEFW ornamn
DEFB 046
DEFW invert
DEFB 033
DEFW envlon
DEFB 017
DEFW volred
DEFB 015
DEFW extnse
DEFB 000
DEFW fspeed
ins: DEFB 0
orn: DEFB 0
note: DEFB 0
envlon:
INC HL
INC HL
LD A,(HL)
AND %10000000
OR C
OR 1*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
volred:
INC HL
INC HL
LD A,(HL)
AND %10000000
OR C
OR 4*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
extnse:
INC HL
INC HL
LD A,(HL)
AND %10000000
OR C
OR 5*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
fspeed:
INC C
INC HL
INC HL
LD A,(HL)
AND %10000000
OR C
OR 3*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
invert:
INC HL
INC HL
LD A,(HL)
AND %10000000
OR C
OR 2*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
ornamn:
LD A,C
LD (orn),A
AND %00001111
LD B,A
INC HL
LD A,(HL)
AND %11110000
OR B
LD (HL),A
INC HL
BIT 4,C
SET 7,(HL)
JR NZ,$+4
RES 7,(HL)
DEC HL
DEC HL
JR nxtcommand
convert:
EX DE,HL
nxtcommand:
PUSH HL
LD HL,comlist-3
findcom: LD A,(DE)
INC HL
INC HL
INC HL
SUB (HL)
JR C,findcom
INC DE
LD C,A
INC HL
LD A,(HL)
INC HL
LD H,(HL)
LD L,A
LD (comjp+1),HL
POP HL
comjp: JP comjp
waitnx:
LD B,0
INC C
EX AF,AF'
ADD C
EX AF,AF'
PUSH HL
LD L,C
LD H,B
SLA C
RL B
ADD HL,HL
ADD HL,HL
ADD HL,HL
ADD HL,HL
ADD HL,BC
LD C,L
LD B,H
POP HL
ADD HL,BC
JR nxtcommand
nwnote:
LD A,C
LD B,-1
calcoct: INC B
SUB 12
JR NC,calcoct
ADD 12
SLA B
SLA B
SLA B
SLA B
OR B
LD (note),A
LD C,A
LD A,(ins)
BIT 4,A
JR Z,$+4
SET 7,C
LD (HL),C
AND %00001111
RLCA
RLCA
RLCA
RLCA
LD C,A
LD A,(orn)
AND %00001111
OR C
INC HL
LD (HL),A
LD A,(orn)
INC HL
BIT 4,A
SET 7,(HL)
JR NZ,$+4
RES 7,(HL)
DEC HL
DEC HL
JR nxtcommand
cncins:
INC HL
INC HL
LD A,(HL)
AND %10001111
OR 6*16
LD (HL),A
DEC HL
DEC HL
JR nxtcommand
instrm:
LD A,C
LD (ins),A
LD A,(note)
BIT 4,C
JR Z,$+4
SET 7,A
LD (HL),A
LD A,C
RLCA
RLCA
RLCA
RLCA
AND %11110000
LD C,A
LD A,(orn)
LD B,A
AND %00001111
OR C
INC HL
LD (HL),A
INC HL
BIT 4,B
SET 7,(HL)
JR NZ,$+4
RES 7,(HL)
DEC HL
DEC HL
JP nxtcommand
patbrk:
RET
calc.addr: LD C,(HL)
INC HL
LD B,(HL)
INC HL
PUSH HL
mod.start: LD HL,0
ADD HL,BC
LD C,L
LD B,H
POP HL
RET
t.patlen: ;32
t.ornhead: ;32*4
t.inshead: ;32*4
DEFM "Now for a bit of waffle to fill up the "
DEFM "remaining space left in this sector. "
DEFM "Craig Turberfield is to blame for "
DEFM "getting me to write this program, it all "
DEFM "started in Gloucester. "
end:
emod.page: EQU 3
eins.header: EQU 32768
eorn.header: EQU 32768+128
esong.table: EQU 32768+256
epatt.lngth: EQU 32768+768
esong.lngth: EQU 32768+800
esong.loop2: EQU 32768+801
epatterns: EQU 32768+802
eornam.data: EQU 37666 ;+2 pages
einstr.data: EQU 45858